Anti-government demonstrators are massed in the heart Bangkok's business district, engaged in a tense standoff with troops in riot gear and rival protesters.

Four explosions detonated near the protest site on Thursday night, according to The Associated Press.

Prime Minister Abhisit Vejjajiva plans to meet with emergency officials and top military leaders to discuss the explosions, said Panitan Wattanayakornn, a government spokesman.

The blasts happened near a train station where anti-government protesters known as the Red Shirts are gathered, said Col. Sansern Kaewkumnerd, spokesman for the Center for Resolutions under Emergency Situation, CNN informs.